UE4 ShooterGame GameSession

1.构造函数：委托绑定（FindSessionComplete,Start,Join,Create,Destroy)

2.OnStartOnlineGameComplete : 调用playercontroller->ClientStartOnlineGame(),清理绑定的委托

3.HandleMatchHasStarted：AddOnStartSessionCompleteDelegate_Handle绑定，session->StartSession()

4.HandleMatchHasEnded:调用playercontroller->ClientEndOnlineGame(),Session->EndSession（）

5.HostSession

6.FindSession

7.JoinSession